[ios] Hide voice guidance test button when voice guidance is disabled

Signed-off-by: Yannik Bloscheck <git@yannikbloscheck.com>

iphone/Maps/UI/Settings/SettingsNavigationView.swift

@@ -92,6 +92,7 @@ struct SettingsNavigationView: View {
                 } header: {
                     Text("pref_tts_title")
                 } footer: {
+                    if shouldProvideVoiceRouting {
                         Button {
                             Settings.playVoiceRoutingTest()
                         } label: {
@@ -106,6 +107,7 @@ struct SettingsNavigationView: View {
                         .padding([.top, .bottom])
                         .listRowInsets(.init(top: 0, leading: 0, bottom: 0, trailing: 0))
                     }
+                }
                 
                 Section {
                     Toggle("avoid_tolls", isOn: $shouldAvoidTollRoadsWhileRouting)